A new approach to the recording of low frequency precordial vibrations.
D004562:Electrocardiography; D006321:Heart / Q000502:physiology; D006334:Heart Function Tests; D006801:Humans; D008722:Methods; D010701:Phonocardiography; D011312:Pressure; D011674:Pulse; D012119:Respiration; D013909:Thorax / Q000502:physiology